P0102 – Meaning, Causes, Symptoms, & Fixes
Code P0102 Definition
Mass or Circuit Airflow (MAF) Circuit Low Voltage Input
What Does P0102 Mean?
The Mass Airflow (MAF) sensor measures the amount of air entering the engine. When code P0102 is set, there is a low voltage output to the ECM, PCM, or ECU depending on your car type (check your owner’s manual for your specific car).
- Check Engine Light
- Less power to the engine
- Low fuel consumption – causing engine damage
- Dirty air filter
- Faulty MAF sensor
- Corroded/Damaged MAF circuit terminals
- Carbon covered MAF sensor screens
Code P0102 Severity – Low
Code P0102 does not pose any serious danger to the driver or the vehicle and there are no drivability issues that may occur. However as the case with all Check Engine Light codes, it should be fixed as soon as possible to prevent any further damage to your vehicle.
Code P0102 Common Diagnosis Mistakes
Replacing the air filter without further inspection of the MAF sensor circuitry and MAF sensor itself.
- Tools Needed to Diagnose:
Difficulty of Diagnosis and Repair – (1-4)
- Clear your Check Engine Light using your FIXD sensor and do a road test to see if your Check Engine Light comes back on (~20-50 miles should be a range).
- Check your air filter and replace if needed.
- Clean your MAF sensor to make sure that there are no pieces in the system that do not belong. Check out this video for a visual step by step walk through.
- The quickest way to check if your Mass Air Flow (MAF) sensor is the problem is to disconnect your electrical harness while your car is running. Check your owner’s manual to locate the MAF sensor for your specific car.
- NOTE: Make sure that all other parts of your vehicle have cooled down (6-8 hours inactive) before doing this test. Reference this video for visual reference
- If your car’s engine shuts off, your MAF sensor is operating normally. If it does not shut off it means that your MAF sensor is not operating normally and should be replaced.
- If these steps do not clear your Check Engine Light, you may need to visit a mechanic because there may be electrical issues.